Find common words in 2 strings

i have 2 string

str1 = ('rabbit is eating grass near a tree');
str2 = ('rabbit is sleeping under tree');

In these 2 strings 'rabbit' 'is' 'tree' is common.... How can i find the common words present in 2 strings....

i want result

str = 'rabbit' 'is' 'tree'

Answer 1

[Azzi Abdelmalek]

str1 = ('rabbit is eating grass near a tree');
str2 = ('rabbit is sleeping under tree');
str=intersect(strsplit(str1),strsplit(str2))

OR, to maintain the order

str=intersect(strsplit(str1),strsplit(str2),'stable')

Answer 2

[Stephen23]

This works in MATLAB versions prior to R2013a:

>> str1 = ('rabbit is eating grass near a tree');
>> str2 = ('rabbit is sleeping under tree');
>> w1 = regexp(str1,'\S+','match');
>> w2 = regexp(str2,'\S+','match');
>> intersect(w1,w2)
ans =
  is
  rabbit
  tree

[Elysi Cochin]

thank you so much all of you